Incognito · 1zero

Windows that keep their cookies apart and forget your visits, and adult sites that open in one on their own.

Incognito windows keep their cookies and site data apart from your other windows. Unless you choose otherwise, they keep no history and forget everything when the last one closes.

Open one with ⌘Ctrl⇧ShiftN, from the browser menu, or with Open in Settings → Privacy and security → Incognito.

What carries over

The ad blocker, cookie banner answers, and secure connections work the same as in your other windows.
Your saved passwords fill in, and logins you save there are kept with the rest.
Extensions run, each as a separate copy, unless you turn that off.

Sites you let through the HTTPS-only warning in incognito are only remembered until incognito closes.

Settings

Settings → Privacy and security → Incognito:

Setting	Default	Does
Save history	Off	On, pages you visit in incognito show in History, like any other window's.
Save cookies and cache	Off	On, incognito stays signed in to sites between windows and restarts, still apart from your other windows. Starts with the next incognito window.
Save tab state	Off	On, incognito tabs come back the next time you open an incognito window, after closing it or quitting. Off, they end when you quit.
Open adult sites in incognito	On	See below.
Run extensions in incognito	On	Each extension runs a separate copy there, and a VPN extension covers incognito too. Off, incognito windows run without extensions.

What extensions save in incognito is forgotten when the last incognito window closes, unless Save cookies and cache is on.

With Open adult sites in incognito on, going to a known adult site opens it in an incognito window instead, so it stays out of your history and your other windows' cookies. The check runs on your computer.

A site counts when it's on the built-in list of well-known adult sites, on any domain they use, or when its address contains porn, hentai, or xxx, or ends in .xxx, .porn, .sex, or .adult.

The Adult sites section, shown while the setting is on, lists the built-in sites and lets you add your own. Each site you add covers its subdomains. Remove all clears the ones you added.